Yii2: Failed creating own template with GII module (advance template) - php

Question

I have some problem here
I have created an advance template with yii2, and i've followed "The Gii code generation tool" from http://www.yiiframework.com/doc-2.0/guide-gii.html
copy folder default template
cp [YII_ROOT]\vendor\yiisoft\yii2-gii\generators\crud\default
[YII_ROOT]\backend\generator\crud
edit [YII_ROOT]\backend\generator\crud\default\views\_form.php
<?= "<?php " ?>$form = ActiveForm::begin(); ?>
<?= "<?=" ?> $form->errorSummary($model) ?> <!-- ADDED HERE -->
<?php foreach ($generator->getColumnNames() as $attribute) {
if (in_array($attribute, $safeAttributes)) {
echo " <?= " . $generator->generateActiveField($attribute) . " ?>\n\n";
}
} ?>
edit [YII_ROOT]\backend\main.php
return [
'bootstrap' => ['gii'],
'modules' => [ 'gii' => [
'class' => 'yii\gii\Module',
'generators' => [ //here
'crud' => [ //name generator
'class' => 'yii\gii\generators\crud\Generator', //class generator
'templates' => [ //setting for out templates
'myTemplate' => '#app\generator\crud\default', //name template => path to template
]
]
],
],
], ];
generate with gii (in this case generate CRUD)
The problem is, i still can't find the difference of _form.php template. what should i do?